<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <SCRIPT src="./js/vue.js"></SCRIPT>
    <style>
        #app {
            border: 2px solid black;
            padding: 10px;
            margin-bottom: 400px;
        }

        .child {
            margin: 20px;
            padding: 10px;
            background-color: #cccccc;
        }
    </style>

</head>

<body>
    <div id="app">
        <h3>父组件范围</h3>
        <child-one></child-one>
        <child-two></child-two>
    </div>

    <template id="ChildOne">
        <div class="child">
            <h3>子组件one</h3>
            <p>info:{{ info }}</p>
            <input type="text" v-model="info">
            <hr>
            <p>msg:{{ msg }}</p>
            <input type="text" v-model="msg">
        </div>
    </template>
    <template id="ChildTwo">
        <div class="child">
            <h3>子组件two</h3>
            <p>info:{{ info }}</p>
            <input type="text" v-model="info">
            <hr>
            <p>msg:{{ msg }}</p>
            <input type="text" v-model="msg">
        </div>
    </template>
</body>
<script>
    var obj = {
        msg: "字符串",
        num: 100,
        flag: false,
        user: {
            name: "tom"
        },
        arr: [1, 2, 3]
    }
    Vue.prototype.$state = Vue.observable({
        msg: "字符串",
        num: 100,
        flag: true,
        user: {
            name: "Tom"
        },
        arr: [1, 2, 3]
    });

    Vue.component("ChildOne", {
        template: "#ChildOne",
        data() {
            return {
                info: this.$state.msg
            }
        },
        computed: {
            msg: {
                get() {
                    return this.$state.msg;
                },
                set(nv) {
                    this.$state.msg = nv;
                }
            }
        },
    })
    Vue.component("ChildTwo", {
        template: "#ChildTwo",
        data() {
            return {
                info: this.$state.msg
            }
        },
        computed: {
            msg: {
                get() {
                    return this.$state.msg;
                },
                set(nv) {
                    this.$state.msg = nv;
                }
            }
        }
    });
    var vm = new Vue({
        el: "#app"
    });
</script>

</html>